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Coordinates detection apparatus

  • US 6,504,532 B1
  • Filed: 05/25/2000
  • Issued: 01/07/2003
  • Est. Priority Date: 07/15/1999
  • Status: Active Grant
First Claim
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1. A coordinates detection apparatus comprising:

  • a display surface;

    two optical units provided at different positions on the border of said display surface, each of said optical unit having a light emitter, a diffusion lens, a read lens, and a light-receiver; and

    a recursive reflection section located at the border of said display surface and which reflects a light emitted from said light-emitter and diffused by said diffusion lens in a fan form towards said light-emitter;

    wherein said light-emitter and said light-receiver are so located that their optic axes are coincident, wherein the coordinates of a point specified on said display surface are detected by focusing the light reflected on said reflection section with said read lens, receiving the reflected light with said light-receiver, and determining the position where reception of the light is hindered.

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